接下来的27年他在马里兰大学从助理教授一路做到了教务长，还成为了美国公民。
He then spent the next 27 years at the University of Maryland, where he rose from assistant professor to provost, becoming an American citizen along the way.
youdao
你不是赛浦路斯的公民。
You are not citizens of Cypress.
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